2. Primary data collection and analysis:
there is some information, which is inaccessible because of secrecy of the companies.
Furthermore, there is also information, which is in an aggregated level and is combined from several measurements, i.e. averages were formed from the individual values. A more specific example is the count of vehicles of each CEP service provider: in total, a number of 211,000 vehicles are used by CEP service providers using secondary data. Some of those vehicles drive more than 100,000 kilometres every year (Manner-Romberg et al. 2009).